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gtk/gdk/gdkevents.c
Owen W. Taylor f50a3af1b7 Handle recursion from motion event handlers 
If a motion event handler (or other handler running from the flush-events
phase of the frame clock) recursed the main loop then flushing wouldn't
complete until after the recursed main loop returned, and various aspects
of the state would get out of sync.

To fix this, change flushing of the event queue to simply mark events as
ready to flush, and let normal event delivery handle the rest.

https://bugzilla.gnome.org/show_bug.cgi?id=705176
2013-11-11 23:17:14 -05:00

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/* GDK - The GIMP Drawing Kit
* Copyright (C) 1995-1997 Peter Mattis, Spencer Kimball and Josh MacDonald
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2 of the License, or (at your option) any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library. If not, see <http://www.gnu.org/licenses/>.
*/
/*
* Modified by the GTK+ Team and others 1997-2000. See the AUTHORS
* file for a list of people on the GTK+ Team. See the ChangeLog
* files for a list of changes. These files are distributed with
* GTK+ at ftp://ftp.gtk.org/pub/gtk/.
*/
#include "config.h"
#include "gdkinternals.h"
#include "gdkdisplayprivate.h"
#include <string.h>
#include <math.h>
/**
* SECTION:events
* @Short_description: Functions for handling events from the window system
* @Title: Events
* @See_also: <link linkend="gdk-Event-Structures">Event Structures</link>
*
* This section describes functions dealing with events from the window
* system.
*
* In GTK+ applications the events are handled automatically in
* gtk_main_do_event() and passed on to the appropriate widgets, so these
* functions are rarely needed. Though some of the fields in the
* <link linkend="gdk-Event-Structures">Event Structures</link> are useful.
*/
typedef struct _GdkIOClosure GdkIOClosure;
struct _GdkIOClosure
{
GDestroyNotify notify;
gpointer data;
};
/* Private variable declarations
*/
static GdkEventFunc _gdk_event_func = NULL; /* Callback for events */
static gpointer _gdk_event_data = NULL;
static GDestroyNotify _gdk_event_notify = NULL;
void
_gdk_event_emit (GdkEvent *event)
{
if (_gdk_event_func)
(*_gdk_event_func) (event, _gdk_event_data);
}
/*********************************************
* Functions for maintaining the event queue *
*********************************************/
/**
* _gdk_event_queue_find_first:
* @display: a #GdkDisplay
*
* Find the first event on the queue that is not still
* being filled in.
*
* Return value: Pointer to the list node for that event, or NULL.
**/
GList*
_gdk_event_queue_find_first (GdkDisplay *display)
{
GList *tmp_list;
GList *pending_motion = NULL;
gboolean paused = display->event_pause_count > 0;
tmp_list = display->queued_events;
while (tmp_list)
{
GdkEventPrivate *event = tmp_list->data;
if ((event->flags & GDK_EVENT_PENDING) == 0 &&
(!paused || (event->flags & GDK_EVENT_FLUSHED) != 0))
{
if (pending_motion)
return pending_motion;
if (event->event.type == GDK_MOTION_NOTIFY && (event->flags & GDK_EVENT_FLUSHED) == 0)
pending_motion = tmp_list;
else
return tmp_list;
}
tmp_list = g_list_next (tmp_list);
}
return NULL;
}
/**
* _gdk_event_queue_prepend:
* @display: a #GdkDisplay
* @event: Event to prepend.
*
* Prepends an event before the head of the event queue.
*
* Returns: the newly prepended list node.
**/
GList*
_gdk_event_queue_prepend (GdkDisplay *display,
GdkEvent *event)
{
display->queued_events = g_list_prepend (display->queued_events, event);
if (!display->queued_tail)
display->queued_tail = display->queued_events;
return display->queued_events;
}
/**
* _gdk_event_queue_append:
* @display: a #GdkDisplay
* @event: Event to append.
*
* Appends an event onto the tail of the event queue.
*
* Returns: the newly appended list node.
**/
GList *
_gdk_event_queue_append (GdkDisplay *display,
GdkEvent *event)
{
display->queued_tail = g_list_append (display->queued_tail, event);
if (!display->queued_events)
display->queued_events = display->queued_tail;
else
display->queued_tail = display->queued_tail->next;
return display->queued_tail;
}
/**
* _gdk_event_queue_insert_after:
* @display: a #GdkDisplay
* @sibling: Append after this event.
* @event: Event to append.
*
* Appends an event after the specified event, or if it isn't in
* the queue, onto the tail of the event queue.
*
* Returns: the newly appended list node.
*
* Since: 2.16
*/
GList*
_gdk_event_queue_insert_after (GdkDisplay *display,
GdkEvent *sibling,
GdkEvent *event)
{
GList *prev = g_list_find (display->queued_events, sibling);
if (prev && prev->next)
{
display->queued_events = g_list_insert_before (display->queued_events, prev->next, event);
return prev->next;
}
else
return _gdk_event_queue_append (display, event);
}
/**
* _gdk_event_queue_insert_before:
* @display: a #GdkDisplay
* @sibling: Append before this event
* @event: Event to prepend
*
* Prepends an event before the specified event, or if it isn't in
* the queue, onto the head of the event queue.
*
* Returns: the newly prepended list node.
*
* Since: 2.16
*/
GList*
_gdk_event_queue_insert_before (GdkDisplay *display,
GdkEvent *sibling,
GdkEvent *event)
{
GList *next = g_list_find (display->queued_events, sibling);
if (next)
{
display->queued_events = g_list_insert_before (display->queued_events, next, event);
return next->prev;
}
else
return _gdk_event_queue_append (display, event);
}
/**
* _gdk_event_queue_remove_link:
* @display: a #GdkDisplay
* @node: node to remove
*
* Removes a specified list node from the event queue.
**/
void
_gdk_event_queue_remove_link (GdkDisplay *display,
GList *node)
{
if (node->prev)
node->prev->next = node->next;
else
display->queued_events = node->next;
if (node->next)
node->next->prev = node->prev;
else
display->queued_tail = node->prev;
}
/**
* _gdk_event_unqueue:
* @display: a #GdkDisplay
*
* Removes and returns the first event from the event
* queue that is not still being filled in.
*
* Return value: the event, or %NULL. Ownership is transferred
* to the caller.
**/
GdkEvent*
_gdk_event_unqueue (GdkDisplay *display)
{
GdkEvent *event = NULL;
GList *tmp_list;
tmp_list = _gdk_event_queue_find_first (display);
if (tmp_list)
{
event = tmp_list->data;
_gdk_event_queue_remove_link (display, tmp_list);
g_list_free_1 (tmp_list);
}
return event;
}
void
_gdk_event_queue_handle_motion_compression (GdkDisplay *display)
{
GList *tmp_list;
GList *pending_motions = NULL;
GdkWindow *pending_motion_window = NULL;
GdkDevice *pending_motion_device = NULL;
/* If the last N events in the event queue are motion notify
* events for the same window, drop all but the last */
tmp_list = display->queued_tail;
while (tmp_list)
{
GdkEventPrivate *event = tmp_list->data;
if (event->flags & GDK_EVENT_PENDING)
break;
if (event->event.type != GDK_MOTION_NOTIFY)
break;
if (pending_motion_window != NULL &&
pending_motion_window != event->event.motion.window)
break;
if (pending_motion_device != NULL &&
pending_motion_device != event->event.motion.device)
break;
if (!event->event.motion.window->event_compression)
break;
pending_motion_window = event->event.motion.window;
pending_motion_device = event->event.motion.device;
pending_motions = tmp_list;
tmp_list = tmp_list->prev;
}
while (pending_motions && pending_motions->next != NULL)
{
GList *next = pending_motions->next;
display->queued_events = g_list_delete_link (display->queued_events,
pending_motions);
pending_motions = next;
}
if (pending_motions &&
pending_motions == display->queued_events &&
pending_motions == display->queued_tail)
{
GdkFrameClock *clock = gdk_window_get_frame_clock (pending_motion_window);
if (clock) /* might be NULL if window was destroyed */
gdk_frame_clock_request_phase (clock, GDK_FRAME_CLOCK_PHASE_FLUSH_EVENTS);
}
}
void
_gdk_event_queue_flush (GdkDisplay *display)
{
GList *tmp_list;
for (tmp_list = display->queued_events; tmp_list; tmp_list = tmp_list->next)
{
GdkEventPrivate *event = tmp_list->data;
event->flags |= GDK_EVENT_FLUSHED;
}
}
/**
* gdk_event_handler_set:
* @func: the function to call to handle events from GDK.
* @data: user data to pass to the function.
* @notify: the function to call when the handler function is removed, i.e. when
* gdk_event_handler_set() is called with another event handler.
*
* Sets the function to call to handle all events from GDK.
*
* Note that GTK+ uses this to install its own event handler, so it is
* usually not useful for GTK+ applications. (Although an application
* can call this function then call gtk_main_do_event() to pass
* events to GTK+.)
**/
void
gdk_event_handler_set (GdkEventFunc func,
gpointer data,
GDestroyNotify notify)
{
if (_gdk_event_notify)
(*_gdk_event_notify) (_gdk_event_data);
_gdk_event_func = func;
_gdk_event_data = data;
_gdk_event_notify = notify;
}
/**
* gdk_events_pending:
*
* Checks if any events are ready to be processed for any display.
*
* Return value: %TRUE if any events are pending.
*/
gboolean
gdk_events_pending (void)
{
GSList *list, *l;
gboolean pending;
pending = FALSE;
list = gdk_display_manager_list_displays (gdk_display_manager_get ());
for (l = list; l; l = l->next)
{
if (_gdk_event_queue_find_first (l->data))
{
pending = TRUE;
goto out;
}
}
for (l = list; l; l = l->next)
{
if (gdk_display_has_pending (l->data))
{
pending = TRUE;
goto out;
}
}
out:
g_slist_free (list);
return pending;
}
/**
* gdk_event_get:
*
* Checks all open displays for a #GdkEvent to process,to be processed
* on, fetching events from the windowing system if necessary.
* See gdk_display_get_event().
*
* Return value: the next #GdkEvent to be processed, or %NULL if no events
* are pending. The returned #GdkEvent should be freed with gdk_event_free().
**/
GdkEvent*
gdk_event_get (void)
{
GSList *list, *l;
GdkEvent *event;
event = NULL;
list = gdk_display_manager_list_displays (gdk_display_manager_get ());
for (l = list; l; l = l->next)
{
event = gdk_display_get_event (l->data);
if (event)
break;
}
g_slist_free (list);
return event;
}
/**
* gdk_event_peek:
*
* If there is an event waiting in the event queue of some open
* display, returns a copy of it. See gdk_display_peek_event().
*
* Return value: a copy of the first #GdkEvent on some event queue, or %NULL if no
* events are in any queues. The returned #GdkEvent should be freed with
* gdk_event_free().
**/
GdkEvent*
gdk_event_peek (void)
{
GSList *list, *l;
GdkEvent *event;
event = NULL;
list = gdk_display_manager_list_displays (gdk_display_manager_get ());
for (l = list; l; l = l->next)
{
event = gdk_display_peek_event (l->data);
if (event)
break;
}
g_slist_free (list);
return event;
}
/**
* gdk_event_put:
* @event: a #GdkEvent.
*
* Appends a copy of the given event onto the front of the event
* queue for event->any.window's display, or the default event
* queue if event->any.window is %NULL. See gdk_display_put_event().
**/
void
gdk_event_put (const GdkEvent *event)
{
GdkDisplay *display;
g_return_if_fail (event != NULL);
if (event->any.window)
display = gdk_window_get_display (event->any.window);
else
{
GDK_NOTE (MULTIHEAD,
g_message ("Falling back to default display for gdk_event_put()"));
display = gdk_display_get_default ();
}
gdk_display_put_event (display, event);
}
static GHashTable *event_hash = NULL;
/**
* gdk_event_new:
* @type: a #GdkEventType
*
* Creates a new event of the given type. All fields are set to 0.
*
* Return value: a newly-allocated #GdkEvent. The returned #GdkEvent
* should be freed with gdk_event_free().
*
* Since: 2.2
**/
GdkEvent*
gdk_event_new (GdkEventType type)
{
GdkEventPrivate *new_private;
GdkEvent *new_event;
if (!event_hash)
event_hash = g_hash_table_new (g_direct_hash, NULL);
new_private = g_slice_new0 (GdkEventPrivate);
new_private->flags = 0;
new_private->screen = NULL;
g_hash_table_insert (event_hash, new_private, GUINT_TO_POINTER (1));
new_event = (GdkEvent *) new_private;
new_event->any.type = type;
/*
* Bytewise 0 initialization is reasonable for most of the
* current event types. Explicitely initialize double fields
* since I trust bytewise 0 == 0. less than for integers
* or pointers.
*/
switch (type)
{
case GDK_MOTION_NOTIFY:
new_event->motion.x = 0.;
new_event->motion.y = 0.;
new_event->motion.x_root = 0.;
new_event->motion.y_root = 0.;
break;
case GDK_BUTTON_PRESS:
case GDK_2BUTTON_PRESS:
case GDK_3BUTTON_PRESS:
case GDK_BUTTON_RELEASE:
new_event->button.x = 0.;
new_event->button.y = 0.;
new_event->button.x_root = 0.;
new_event->button.y_root = 0.;
break;
case GDK_TOUCH_BEGIN:
case GDK_TOUCH_UPDATE:
case GDK_TOUCH_END:
case GDK_TOUCH_CANCEL:
new_event->touch.x = 0.;
new_event->touch.y = 0.;
new_event->touch.x_root = 0.;
new_event->touch.y_root = 0.;
break;
case GDK_SCROLL:
new_event->scroll.x = 0.;
new_event->scroll.y = 0.;
new_event->scroll.x_root = 0.;
new_event->scroll.y_root = 0.;
new_event->scroll.delta_x = 0.;
new_event->scroll.delta_y = 0.;
break;
case GDK_ENTER_NOTIFY:
case GDK_LEAVE_NOTIFY:
new_event->crossing.x = 0.;
new_event->crossing.y = 0.;
new_event->crossing.x_root = 0.;
new_event->crossing.y_root = 0.;
break;
default:
break;
}
return new_event;
}
static gboolean
gdk_event_is_allocated (const GdkEvent *event)
{
if (event_hash)
return g_hash_table_lookup (event_hash, event) != NULL;
return FALSE;
}
void
_gdk_event_set_pointer_emulated (GdkEvent *event,
gboolean emulated)
{
if (gdk_event_is_allocated (event))
{
GdkEventPrivate *private = (GdkEventPrivate *) event;
if (emulated)
private->flags |= GDK_EVENT_POINTER_EMULATED;
else
private->flags &= ~(GDK_EVENT_POINTER_EMULATED);
}
}
gboolean
_gdk_event_get_pointer_emulated (GdkEvent *event)
{
if (gdk_event_is_allocated (event))
return (((GdkEventPrivate *) event)->flags & GDK_EVENT_POINTER_EMULATED) != 0;
return FALSE;
}
/**
* gdk_event_copy:
* @event: a #GdkEvent
*
* Copies a #GdkEvent, copying or incrementing the reference count of the
* resources associated with it (e.g. #GdkWindow's and strings).
*
* Return value: a copy of @event. The returned #GdkEvent should be freed with
* gdk_event_free().
**/
GdkEvent*
gdk_event_copy (const GdkEvent *event)
{
GdkEventPrivate *new_private;
GdkEvent *new_event;
g_return_val_if_fail (event != NULL, NULL);
new_event = gdk_event_new (GDK_NOTHING);
new_private = (GdkEventPrivate *)new_event;
*new_event = *event;
if (new_event->any.window)
g_object_ref (new_event->any.window);
if (gdk_event_is_allocated (event))
{
GdkEventPrivate *private = (GdkEventPrivate *)event;
new_private->screen = private->screen;
new_private->device = private->device;
new_private->source_device = private->source_device;
}
switch (event->any.type)
{
case GDK_KEY_PRESS:
case GDK_KEY_RELEASE:
new_event->key.string = g_strdup (event->key.string);
break;
case GDK_ENTER_NOTIFY:
case GDK_LEAVE_NOTIFY:
if (event->crossing.subwindow != NULL)
g_object_ref (event->crossing.subwindow);
break;
case GDK_DRAG_ENTER:
case GDK_DRAG_LEAVE:
case GDK_DRAG_MOTION:
case GDK_DRAG_STATUS:
case GDK_DROP_START:
case GDK_DROP_FINISHED:
g_object_ref (event->dnd.context);
break;
case GDK_EXPOSE:
case GDK_DAMAGE:
if (event->expose.region)
new_event->expose.region = cairo_region_copy (event->expose.region);
break;
case GDK_SETTING:
new_event->setting.name = g_strdup (new_event->setting.name);
break;
case GDK_BUTTON_PRESS:
case GDK_2BUTTON_PRESS:
case GDK_3BUTTON_PRESS:
case GDK_BUTTON_RELEASE:
if (event->button.axes)
new_event->button.axes = g_memdup (event->button.axes,
sizeof (gdouble) * gdk_device_get_n_axes (event->button.device));
break;
case GDK_TOUCH_BEGIN:
case GDK_TOUCH_UPDATE:
case GDK_TOUCH_END:
case GDK_TOUCH_CANCEL:
if (event->touch.axes)
new_event->touch.axes = g_memdup (event->touch.axes,
sizeof (gdouble) * gdk_device_get_n_axes (event->touch.device));
break;
case GDK_MOTION_NOTIFY:
if (event->motion.axes)
new_event->motion.axes = g_memdup (event->motion.axes,
sizeof (gdouble) * gdk_device_get_n_axes (event->motion.device));
break;
case GDK_OWNER_CHANGE:
new_event->owner_change.owner = event->owner_change.owner;
if (new_event->owner_change.owner)
g_object_ref (new_event->owner_change.owner);
break;
case GDK_SELECTION_CLEAR:
case GDK_SELECTION_NOTIFY:
case GDK_SELECTION_REQUEST:
new_event->selection.requestor = event->selection.requestor;
if (new_event->selection.requestor)
g_object_ref (new_event->selection.requestor);
break;
default:
break;
}
if (gdk_event_is_allocated (event))
_gdk_display_event_data_copy (gdk_display_get_default (), event, new_event);
return new_event;
}
/**
* gdk_event_free:
* @event: a #GdkEvent.
*
* Frees a #GdkEvent, freeing or decrementing any resources associated with it.
* Note that this function should only be called with events returned from
* functions such as gdk_event_peek(), gdk_event_get(), gdk_event_copy()
* and gdk_event_new().
**/
void
gdk_event_free (GdkEvent *event)
{
GdkDisplay *display;
g_return_if_fail (event != NULL);
if (event->any.window)
g_object_unref (event->any.window);
switch (event->any.type)
{
case GDK_KEY_PRESS:
case GDK_KEY_RELEASE:
g_free (event->key.string);
break;
case GDK_ENTER_NOTIFY:
case GDK_LEAVE_NOTIFY:
if (event->crossing.subwindow != NULL)
g_object_unref (event->crossing.subwindow);
break;
case GDK_DRAG_ENTER:
case GDK_DRAG_LEAVE:
case GDK_DRAG_MOTION:
case GDK_DRAG_STATUS:
case GDK_DROP_START:
case GDK_DROP_FINISHED:
if (event->dnd.context != NULL)
g_object_unref (event->dnd.context);
break;
case GDK_BUTTON_PRESS:
case GDK_2BUTTON_PRESS:
case GDK_3BUTTON_PRESS:
case GDK_BUTTON_RELEASE:
g_free (event->button.axes);
break;
case GDK_TOUCH_BEGIN:
case GDK_TOUCH_UPDATE:
case GDK_TOUCH_END:
case GDK_TOUCH_CANCEL:
g_free (event->touch.axes);
break;
case GDK_EXPOSE:
case GDK_DAMAGE:
if (event->expose.region)
cairo_region_destroy (event->expose.region);
break;
case GDK_MOTION_NOTIFY:
g_free (event->motion.axes);
break;
case GDK_SETTING:
g_free (event->setting.name);
break;
case GDK_OWNER_CHANGE:
if (event->owner_change.owner)
g_object_unref (event->owner_change.owner);
break;
case GDK_SELECTION_CLEAR:
case GDK_SELECTION_NOTIFY:
case GDK_SELECTION_REQUEST:
if (event->selection.requestor)
g_object_unref (event->selection.requestor);
break;
default:
break;
}
display = gdk_display_get_default ();
if (display)
_gdk_display_event_data_free (display, event);
g_hash_table_remove (event_hash, event);
g_slice_free (GdkEventPrivate, (GdkEventPrivate*) event);
}
/**
* gdk_event_get_window:
* @event: a #GdkEvent
*
* Extracts the #GdkWindow associated with an event.
*
* Return value: (transfer none): The #GdkWindow associated with the event
*
* Since: 3.10
*/
GdkWindow *
gdk_event_get_window (const GdkEvent *event)
{
g_return_val_if_fail (event != NULL, NULL);
return event->any.window;
}
/**
* gdk_event_get_time:
* @event: a #GdkEvent
*
* Returns the time stamp from @event, if there is one; otherwise
* returns #GDK_CURRENT_TIME. If @event is %NULL, returns #GDK_CURRENT_TIME.
*
* Return value: time stamp field from @event
**/
guint32
gdk_event_get_time (const GdkEvent *event)
{
if (event)
switch (event->type)
{
case GDK_MOTION_NOTIFY:
return event->motion.time;
case GDK_BUTTON_PRESS:
case GDK_2BUTTON_PRESS:
case GDK_3BUTTON_PRESS:
case GDK_BUTTON_RELEASE:
return event->button.time;
case GDK_TOUCH_BEGIN:
case GDK_TOUCH_UPDATE:
case GDK_TOUCH_END:
case GDK_TOUCH_CANCEL:
return event->touch.time;
case GDK_SCROLL:
return event->scroll.time;
case GDK_KEY_PRESS:
case GDK_KEY_RELEASE:
return event->key.time;
case GDK_ENTER_NOTIFY:
case GDK_LEAVE_NOTIFY:
return event->crossing.time;
case GDK_PROPERTY_NOTIFY:
return event->property.time;
case GDK_SELECTION_CLEAR:
case GDK_SELECTION_REQUEST:
case GDK_SELECTION_NOTIFY:
return event->selection.time;
case GDK_PROXIMITY_IN:
case GDK_PROXIMITY_OUT:
return event->proximity.time;
case GDK_DRAG_ENTER:
case GDK_DRAG_LEAVE:
case GDK_DRAG_MOTION:
case GDK_DRAG_STATUS:
case GDK_DROP_START:
case GDK_DROP_FINISHED:
return event->dnd.time;
case GDK_CLIENT_EVENT:
case GDK_VISIBILITY_NOTIFY:
case GDK_CONFIGURE:
case GDK_FOCUS_CHANGE:
case GDK_NOTHING:
case GDK_DAMAGE:
case GDK_DELETE:
case GDK_DESTROY:
case GDK_EXPOSE:
case GDK_MAP:
case GDK_UNMAP:
case GDK_WINDOW_STATE:
case GDK_SETTING:
case GDK_OWNER_CHANGE:
case GDK_GRAB_BROKEN:
case GDK_EVENT_LAST:
/* return current time */
break;
}
return GDK_CURRENT_TIME;
}
/**
* gdk_event_get_state:
* @event: a #GdkEvent or NULL
* @state: (out): return location for state
*
* If the event contains a "state" field, puts that field in @state. Otherwise
* stores an empty state (0). Returns %TRUE if there was a state field
* in the event. @event may be %NULL, in which case it's treated
* as if the event had no state field.
*
* Return value: %TRUE if there was a state field in the event
**/
gboolean
gdk_event_get_state (const GdkEvent *event,
GdkModifierType *state)
{
g_return_val_if_fail (state != NULL, FALSE);
if (event)
switch (event->type)
{
case GDK_MOTION_NOTIFY:
*state = event->motion.state;
return TRUE;
case GDK_BUTTON_PRESS:
case GDK_2BUTTON_PRESS:
case GDK_3BUTTON_PRESS:
case GDK_BUTTON_RELEASE:
*state = event->button.state;
return TRUE;
case GDK_TOUCH_BEGIN:
case GDK_TOUCH_UPDATE:
case GDK_TOUCH_END:
case GDK_TOUCH_CANCEL:
*state = event->touch.state;
return TRUE;
case GDK_SCROLL:
*state = event->scroll.state;
return TRUE;
case GDK_KEY_PRESS:
case GDK_KEY_RELEASE:
*state = event->key.state;
return TRUE;
case GDK_ENTER_NOTIFY:
case GDK_LEAVE_NOTIFY:
*state = event->crossing.state;
return TRUE;
case GDK_PROPERTY_NOTIFY:
case GDK_VISIBILITY_NOTIFY:
case GDK_CLIENT_EVENT:
case GDK_CONFIGURE:
case GDK_FOCUS_CHANGE:
case GDK_SELECTION_CLEAR:
case GDK_SELECTION_REQUEST:
case GDK_SELECTION_NOTIFY:
case GDK_PROXIMITY_IN:
case GDK_PROXIMITY_OUT:
case GDK_DAMAGE:
case GDK_DRAG_ENTER:
case GDK_DRAG_LEAVE:
case GDK_DRAG_MOTION:
case GDK_DRAG_STATUS:
case GDK_DROP_START:
case GDK_DROP_FINISHED:
case GDK_NOTHING:
case GDK_DELETE:
case GDK_DESTROY:
case GDK_EXPOSE:
case GDK_MAP:
case GDK_UNMAP:
case GDK_WINDOW_STATE:
case GDK_SETTING:
case GDK_OWNER_CHANGE:
case GDK_GRAB_BROKEN:
case GDK_EVENT_LAST:
/* no state field */
break;
}
*state = 0;
return FALSE;
}
/**
* gdk_event_get_coords:
* @event: a #GdkEvent
* @x_win: (out): location to put event window x coordinate
* @y_win: (out): location to put event window y coordinate
*
* Extract the event window relative x/y coordinates from an event.
*
* Return value: %TRUE if the event delivered event window coordinates
**/
gboolean
gdk_event_get_coords (const GdkEvent *event,
gdouble *x_win,
gdouble *y_win)
{
gdouble x = 0, y = 0;
gboolean fetched = TRUE;
g_return_val_if_fail (event != NULL, FALSE);
switch (event->type)
{
case GDK_CONFIGURE:
x = event->configure.x;
y = event->configure.y;
break;
case GDK_ENTER_NOTIFY:
case GDK_LEAVE_NOTIFY:
x = event->crossing.x;
y = event->crossing.y;
break;
case GDK_SCROLL:
x = event->scroll.x;
y = event->scroll.y;
break;
case GDK_BUTTON_PRESS:
case GDK_2BUTTON_PRESS:
case GDK_3BUTTON_PRESS:
case GDK_BUTTON_RELEASE:
x = event->button.x;
y = event->button.y;
break;
case GDK_TOUCH_BEGIN:
case GDK_TOUCH_UPDATE:
case GDK_TOUCH_END:
case GDK_TOUCH_CANCEL:
x = event->touch.x;
y = event->touch.y;
break;
case GDK_MOTION_NOTIFY:
x = event->motion.x;
y = event->motion.y;
break;
default:
fetched = FALSE;
break;
}
if (x_win)
*x_win = x;
if (y_win)
*y_win = y;
return fetched;
}
/**
* gdk_event_get_root_coords:
* @event: a #GdkEvent
* @x_root: (out): location to put root window x coordinate
* @y_root: (out): location to put root window y coordinate
*
* Extract the root window relative x/y coordinates from an event.
*
* Return value: %TRUE if the event delivered root window coordinates
**/
gboolean
gdk_event_get_root_coords (const GdkEvent *event,
gdouble *x_root,
gdouble *y_root)
{
gdouble x = 0, y = 0;
gboolean fetched = TRUE;
g_return_val_if_fail (event != NULL, FALSE);
switch (event->type)
{
case GDK_MOTION_NOTIFY:
x = event->motion.x_root;
y = event->motion.y_root;
break;
case GDK_SCROLL:
x = event->scroll.x_root;
y = event->scroll.y_root;
break;
case GDK_BUTTON_PRESS:
case GDK_2BUTTON_PRESS:
case GDK_3BUTTON_PRESS:
case GDK_BUTTON_RELEASE:
x = event->button.x_root;
y = event->button.y_root;
break;
case GDK_TOUCH_BEGIN:
case GDK_TOUCH_UPDATE:
case GDK_TOUCH_END:
case GDK_TOUCH_CANCEL:
x = event->touch.x_root;
y = event->touch.y_root;
break;
case GDK_ENTER_NOTIFY:
case GDK_LEAVE_NOTIFY:
x = event->crossing.x_root;
y = event->crossing.y_root;
break;
case GDK_DRAG_ENTER:
case GDK_DRAG_LEAVE:
case GDK_DRAG_MOTION:
case GDK_DRAG_STATUS:
case GDK_DROP_START:
case GDK_DROP_FINISHED:
x = event->dnd.x_root;
y = event->dnd.y_root;
break;
default:
fetched = FALSE;
break;
}
if (x_root)
*x_root = x;
if (y_root)
*y_root = y;
return fetched;
}
/**
* gdk_event_get_button:
* @event: a #GdkEvent
* @button: (out): location to store mouse button number
*
* Extract the button number from an event.
*
* Return value: %TRUE if the event delivered a button number
*
* Since: 3.2
**/
gboolean
gdk_event_get_button (const GdkEvent *event,
guint *button)
{
gboolean fetched = TRUE;
guint number = 0;
g_return_val_if_fail (event != NULL, FALSE);
switch (event->type)
{
case GDK_BUTTON_PRESS:
case GDK_2BUTTON_PRESS:
case GDK_3BUTTON_PRESS:
case GDK_BUTTON_RELEASE:
number = event->button.button;
break;
default:
fetched = FALSE;
break;
}
if (button)
*button = number;
return fetched;
}
/**
* gdk_event_get_click_count:
* @event: a #GdkEvent
* @click_count: (out): location to store click count
*
* Extracts the click count from an event.
*
* Return value: %TRUE if the event delivered a click count
*
* Since: 3.2
*/
gboolean
gdk_event_get_click_count (const GdkEvent *event,
guint *click_count)
{
gboolean fetched = TRUE;
guint number = 0;
g_return_val_if_fail (event != NULL, FALSE);
switch (event->type)
{
case GDK_BUTTON_PRESS:
case GDK_BUTTON_RELEASE:
number = 1;
break;
case GDK_2BUTTON_PRESS:
number = 2;
break;
case GDK_3BUTTON_PRESS:
number = 3;
break;
default:
fetched = FALSE;
break;
}
if (click_count)
*click_count = number;
return fetched;
}
/**
* gdk_event_get_keyval:
* @event: a #GdkEvent
* @keyval: (out): location to store the keyval
*
* Extracts the keyval from an event.
*
* Return value: %TRUE if the event delivered a key symbol
*
* Since: 3.2
*/
gboolean
gdk_event_get_keyval (const GdkEvent *event,
guint *keyval)
{
gboolean fetched = TRUE;
guint number = 0;
switch (event->type)
{
case GDK_KEY_PRESS:
case GDK_KEY_RELEASE:
number = event->key.keyval;
break;
default:
fetched = FALSE;
break;
}
if (keyval)
*keyval = number;
return fetched;
}
/**
* gdk_event_get_keycode:
* @event: a #GdkEvent
* @keycode: (out): location to store the keycode
*
* Extracts the hardware keycode from an event.
*
* Return value: %TRUE if the event delivered a hardware keycode
*
* Since: 3.2
*/
gboolean
gdk_event_get_keycode (const GdkEvent *event,
guint16 *keycode)
{
gboolean fetched = TRUE;
guint16 number = 0;
switch (event->type)
{
case GDK_KEY_PRESS:
case GDK_KEY_RELEASE:
number = event->key.hardware_keycode;
break;
default:
fetched = FALSE;
break;
}
if (keycode)
*keycode = number;
return fetched;
}
/**
* gdk_event_get_scroll_direction:
* @event: a #GdkEvent
* @direction: (out): location to store the scroll direction
*
* Extracts the scroll direction from an event.
*
* Return value: %TRUE if the event delivered a scroll direction
*
* Since: 3.2
*/
gboolean
gdk_event_get_scroll_direction (const GdkEvent *event,
GdkScrollDirection *direction)
{
gboolean fetched = TRUE;
GdkScrollDirection dir = 0;
switch (event->type)
{
case GDK_SCROLL:
if (event->scroll.direction == GDK_SCROLL_SMOOTH)
fetched = FALSE;
else
dir = event->scroll.direction;
break;
default:
fetched = FALSE;
break;
}
if (direction)
*direction = dir;
return fetched;
}
/**
* gdk_event_get_scroll_deltas:
* @event: a #GdkEvent
* @delta_x: (out): return location for X delta
* @delta_y: (out): return location for Y delta
*
* Retrieves the scroll deltas from a #GdkEvent
*
* Returns: %TRUE if the event contains smooth scroll information
*
* Since: 3.4
**/
gboolean
gdk_event_get_scroll_deltas (const GdkEvent *event,
gdouble *delta_x,
gdouble *delta_y)
{
gboolean fetched = TRUE;
gdouble dx = 0.0;
gdouble dy = 0.0;
switch (event->type)
{
case GDK_SCROLL:
if (event->scroll.direction == GDK_SCROLL_SMOOTH)
{
dx = event->scroll.delta_x;
dy = event->scroll.delta_y;
}
else
fetched = FALSE;
break;
default:
fetched = FALSE;
break;
}
if (delta_x)
*delta_x = dx;
if (delta_y)
*delta_y = dy;
return fetched;
}
/**
* gdk_event_get_axis:
* @event: a #GdkEvent
* @axis_use: the axis use to look for
* @value: (out): location to store the value found
*
* Extract the axis value for a particular axis use from
* an event structure.
*
* Return value: %TRUE if the specified axis was found, otherwise %FALSE
**/
gboolean
gdk_event_get_axis (const GdkEvent *event,
GdkAxisUse axis_use,
gdouble *value)
{
gdouble *axes;
GdkDevice *device;
g_return_val_if_fail (event != NULL, FALSE);
if (axis_use == GDK_AXIS_X || axis_use == GDK_AXIS_Y)
{
gdouble x, y;
switch (event->type)
{
case GDK_MOTION_NOTIFY:
x = event->motion.x;
y = event->motion.y;
break;
case GDK_SCROLL:
x = event->scroll.x;
y = event->scroll.y;
break;
case GDK_BUTTON_PRESS:
case GDK_BUTTON_RELEASE:
x = event->button.x;
y = event->button.y;
break;
case GDK_TOUCH_BEGIN:
case GDK_TOUCH_UPDATE:
case GDK_TOUCH_END:
case GDK_TOUCH_CANCEL:
x = event->touch.x;
y = event->touch.y;
break;
case GDK_ENTER_NOTIFY:
case GDK_LEAVE_NOTIFY:
x = event->crossing.x;
y = event->crossing.y;
break;
default:
return FALSE;
}
if (axis_use == GDK_AXIS_X && value)
*value = x;
if (axis_use == GDK_AXIS_Y && value)
*value = y;
return TRUE;
}
else if (event->type == GDK_BUTTON_PRESS ||
event->type == GDK_BUTTON_RELEASE)
{
device = event->button.device;
axes = event->button.axes;
}
else if (event->type == GDK_TOUCH_BEGIN ||
event->type == GDK_TOUCH_UPDATE ||
event->type == GDK_TOUCH_END ||
event->type == GDK_TOUCH_CANCEL)
{
device = event->touch.device;
axes = event->touch.axes;
}
else if (event->type == GDK_MOTION_NOTIFY)
{
device = event->motion.device;
axes = event->motion.axes;
}
else
return FALSE;
return gdk_device_get_axis (device, axes, axis_use, value);
}
/**
* gdk_event_set_device:
* @event: a #GdkEvent
* @device: a #GdkDevice
*
* Sets the device for @event to @device. The event must
* have been allocated by GTK+, for instance, by
* gdk_event_copy().
*
* Since: 3.0
**/
void
gdk_event_set_device (GdkEvent *event,
GdkDevice *device)
{
GdkEventPrivate *private;
g_return_if_fail (gdk_event_is_allocated (event));
private = (GdkEventPrivate *) event;
private->device = device;
switch (event->type)
{
case GDK_MOTION_NOTIFY:
event->motion.device = device;
break;
case GDK_BUTTON_PRESS:
case GDK_2BUTTON_PRESS:
case GDK_3BUTTON_PRESS:
case GDK_BUTTON_RELEASE:
event->button.device = device;
break;
case GDK_TOUCH_BEGIN:
case GDK_TOUCH_UPDATE:
case GDK_TOUCH_END:
case GDK_TOUCH_CANCEL:
event->touch.device = device;
break;
case GDK_SCROLL:
event->scroll.device = device;
break;
case GDK_PROXIMITY_IN:
case GDK_PROXIMITY_OUT:
event->proximity.device = device;
break;
default:
break;
}
}
/**
* gdk_event_get_device:
* @event: a #GdkEvent.
*
* If the event contains a "device" field, this function will return
* it, else it will return %NULL.
*
* Returns: (transfer none): a #GdkDevice, or %NULL.
*
* Since: 3.0
**/
GdkDevice *
gdk_event_get_device (const GdkEvent *event)
{
g_return_val_if_fail (event != NULL, NULL);
if (gdk_event_is_allocated (event))
{
GdkEventPrivate *private = (GdkEventPrivate *) event;
if (private->device)
return private->device;
}
switch (event->type)
{
case GDK_MOTION_NOTIFY:
return event->motion.device;
case GDK_BUTTON_PRESS:
case GDK_2BUTTON_PRESS:
case GDK_3BUTTON_PRESS:
case GDK_BUTTON_RELEASE:
return event->button.device;
case GDK_TOUCH_BEGIN:
case GDK_TOUCH_UPDATE:
case GDK_TOUCH_END:
case GDK_TOUCH_CANCEL:
return event->touch.device;
case GDK_SCROLL:
return event->scroll.device;
case GDK_PROXIMITY_IN:
case GDK_PROXIMITY_OUT:
return event->proximity.device;
default:
break;
}
/* Fallback if event has no device set */
switch (event->type)
{
case GDK_MOTION_NOTIFY:
case GDK_BUTTON_PRESS:
case GDK_2BUTTON_PRESS:
case GDK_3BUTTON_PRESS:
case GDK_BUTTON_RELEASE:
case GDK_TOUCH_BEGIN:
case GDK_TOUCH_UPDATE:
case GDK_TOUCH_END:
case GDK_TOUCH_CANCEL:
case GDK_ENTER_NOTIFY:
case GDK_LEAVE_NOTIFY:
case GDK_FOCUS_CHANGE:
case GDK_PROXIMITY_IN:
case GDK_PROXIMITY_OUT:
case GDK_DRAG_ENTER:
case GDK_DRAG_LEAVE:
case GDK_DRAG_MOTION:
case GDK_DRAG_STATUS:
case GDK_DROP_START:
case GDK_DROP_FINISHED:
case GDK_SCROLL:
case GDK_GRAB_BROKEN:
case GDK_KEY_PRESS:
case GDK_KEY_RELEASE:
{
GdkDisplay *display;
GdkDeviceManager *device_manager;
GdkDevice *client_pointer;
g_warning ("Event with type %d not holding a GdkDevice. "
"It is most likely synthesized outside Gdk/GTK+\n",
event->type);
display = gdk_window_get_display (event->any.window);
device_manager = gdk_display_get_device_manager (display);
client_pointer = gdk_device_manager_get_client_pointer (device_manager);
if (event->type == GDK_KEY_PRESS ||
event->type == GDK_KEY_RELEASE)
return gdk_device_get_associated_device (client_pointer);
else
return client_pointer;
}
break;
default:
return NULL;
}
}
/**
* gdk_event_set_source_device:
* @event: a #GdkEvent
* @device: a #GdkDevice
*
* Sets the slave device for @event to @device.
*
* The event must have been allocated by GTK+,
* for instance by gdk_event_copy().
*
* Since: 3.0
**/
void
gdk_event_set_source_device (GdkEvent *event,
GdkDevice *device)
{
GdkEventPrivate *private;
g_return_if_fail (gdk_event_is_allocated (event));
g_return_if_fail (GDK_IS_DEVICE (device));
private = (GdkEventPrivate *) event;
private->source_device = device;
}
/**
* gdk_event_get_source_device:
* @event: a #GdkEvent
*
* This function returns the hardware (slave) #GdkDevice that has
* triggered the event, falling back to the virtual (master) device
* (as in gdk_event_get_device()) if the event wasn't caused by
* interaction with a hardware device. This may happen for example
* in synthesized crossing events after a #GdkWindow updates its
* geometry or a grab is acquired/released.
*
* If the event does not contain a device field, this function will
* return %NULL.
*
* Returns: (transfer none): a #GdkDevice, or %NULL.
*
* Since: 3.0
**/
GdkDevice *
gdk_event_get_source_device (const GdkEvent *event)
{
GdkEventPrivate *private;
g_return_val_if_fail (event != NULL, NULL);
if (!gdk_event_is_allocated (event))
return NULL;
private = (GdkEventPrivate *) event;
if (private->source_device)
return private->source_device;
/* Fallback to event device */
return gdk_event_get_device (event);
}
/**
* gdk_event_request_motions:
* @event: a valid #GdkEvent
*
* Request more motion notifies if @event is a motion notify hint event.
*
* This function should be used instead of gdk_window_get_pointer() to
* request further motion notifies, because it also works for extension
* events where motion notifies are provided for devices other than the
* core pointer. Coordinate extraction, processing and requesting more
* motion events from a %GDK_MOTION_NOTIFY event usually works like this:
*
* |[
* {
* /&ast; motion_event handler &ast;/
* x = motion_event->x;
* y = motion_event->y;
* /&ast; handle (x,y) motion &ast;/
* gdk_event_request_motions (motion_event); /&ast; handles is_hint events &ast;/
* }
* ]|
*
* Since: 2.12
**/
void
gdk_event_request_motions (const GdkEventMotion *event)
{
GdkDisplay *display;
g_return_if_fail (event != NULL);
if (event->type == GDK_MOTION_NOTIFY && event->is_hint)
{
gdk_device_get_state (event->device, event->window, NULL, NULL);
display = gdk_window_get_display (event->window);
_gdk_display_enable_motion_hints (display, event->device);
}
}
/**
* gdk_event_triggers_context_menu:
* @event: a #GdkEvent, currently only button events are meaningful values
*
* This function returns whether a #GdkEventButton should trigger a
* context menu, according to platform conventions. The right mouse
* button always triggers context menus. Additionally, if
* gdk_keymap_get_modifier_mask() returns a non-0 mask for
* %GDK_MODIFIER_INTENT_CONTEXT_MENU, then the left mouse button will
* also trigger a context menu if this modifier is pressed.
*
* This function should always be used instead of simply checking for
* event->button == %GDK_BUTTON_SECONDARY.
*
* Returns: %TRUE if the event should trigger a context menu.
*
* Since: 3.4
**/
gboolean
gdk_event_triggers_context_menu (const GdkEvent *event)
{
g_return_val_if_fail (event != NULL, FALSE);
if (event->type == GDK_BUTTON_PRESS)
{
const GdkEventButton *bevent = (const GdkEventButton *) event;
GdkDisplay *display;
GdkModifierType modifier;
g_return_val_if_fail (GDK_IS_WINDOW (bevent->window), FALSE);
if (bevent->button == GDK_BUTTON_SECONDARY &&
! (bevent->state & (GDK_BUTTON1_MASK | GDK_BUTTON2_MASK)))
return TRUE;
display = gdk_window_get_display (bevent->window);
modifier = gdk_keymap_get_modifier_mask (gdk_keymap_get_for_display (display),
GDK_MODIFIER_INTENT_CONTEXT_MENU);
if (modifier != 0 &&
bevent->button == GDK_BUTTON_PRIMARY &&
! (bevent->state & (GDK_BUTTON2_MASK | GDK_BUTTON3_MASK)) &&
(bevent->state & modifier))
return TRUE;
}
return FALSE;
}
static gboolean
gdk_events_get_axis_distances (GdkEvent *event1,
GdkEvent *event2,
gdouble *x_distance,
gdouble *y_distance,
gdouble *distance)
{
gdouble x1, x2, y1, y2;
gdouble xd, yd;
if (!gdk_event_get_coords (event1, &x1, &y1) ||
!gdk_event_get_coords (event2, &x2, &y2))
return FALSE;
xd = x2 - x1;
yd = y2 - y1;
if (x_distance)
*x_distance = xd;
if (y_distance)
*y_distance = yd;
if (distance)
*distance = sqrt ((xd * xd) + (yd * yd));
return TRUE;
}
/**
* gdk_events_get_distance:
* @event1: first #GdkEvent
* @event2: second #GdkEvent
* @distance: (out): return location for the distance
*
* If both events have X/Y information, the distance between both coordinates
* (as in a straight line going from @event1 to @event2) will be returned.
*
* Returns: %TRUE if the distance could be calculated.
*
* Since: 3.0
**/
gboolean
gdk_events_get_distance (GdkEvent *event1,
GdkEvent *event2,
gdouble *distance)
{
return gdk_events_get_axis_distances (event1, event2,
NULL, NULL,
distance);
}
/**
* gdk_events_get_angle:
* @event1: first #GdkEvent
* @event2: second #GdkEvent
* @angle: (out): return location for the relative angle between both events
*
* If both events contain X/Y information, this function will return %TRUE
* and return in @angle the relative angle from @event1 to @event2. The rotation
* direction for positive angles is from the positive X axis towards the positive
* Y axis.
*
* Returns: %TRUE if the angle could be calculated.
*
* Since: 3.0
**/
gboolean
gdk_events_get_angle (GdkEvent *event1,
GdkEvent *event2,
gdouble *angle)
{
gdouble x_distance, y_distance, distance;
if (!gdk_events_get_axis_distances (event1, event2,
&x_distance, &y_distance,
&distance))
return FALSE;
if (angle)
{
*angle = atan2 (x_distance, y_distance);
/* Invert angle */
*angle = (2 * G_PI) - *angle;
/* Shift it 90° */
*angle += G_PI / 2;
/* And constraint it to 0°-360° */
*angle = fmod (*angle, 2 * G_PI);
}
return TRUE;
}
/**
* gdk_events_get_center:
* @event1: first #GdkEvent
* @event2: second #GdkEvent
* @x: (out): return location for the X coordinate of the center
* @y: (out): return location for the Y coordinate of the center
*
* If both events contain X/Y information, the center of both coordinates
* will be returned in @x and @y.
*
* Returns: %TRUE if the center could be calculated.
*
* Since: 3.0
**/
gboolean
gdk_events_get_center (GdkEvent *event1,
GdkEvent *event2,
gdouble *x,
gdouble *y)
{
gdouble x1, x2, y1, y2;
if (!gdk_event_get_coords (event1, &x1, &y1) ||
!gdk_event_get_coords (event2, &x2, &y2))
return FALSE;
if (x)
*x = (x2 + x1) / 2;
if (y)
*y = (y2 + y1) / 2;
return TRUE;
}
/**
* gdk_event_set_screen:
* @event: a #GdkEvent
* @screen: a #GdkScreen
*
* Sets the screen for @event to @screen. The event must
* have been allocated by GTK+, for instance, by
* gdk_event_copy().
*
* Since: 2.2
**/
void
gdk_event_set_screen (GdkEvent *event,
GdkScreen *screen)
{
GdkEventPrivate *private;
g_return_if_fail (gdk_event_is_allocated (event));
private = (GdkEventPrivate *)event;
private->screen = screen;
}
/**
* gdk_event_get_screen:
* @event: a #GdkEvent
*
* Returns the screen for the event. The screen is
* typically the screen for <literal>event->any.window</literal>, but
* for events such as mouse events, it is the screen
* where the pointer was when the event occurs -
* that is, the screen which has the root window
* to which <literal>event->motion.x_root</literal> and
* <literal>event->motion.y_root</literal> are relative.
*
* Return value: (transfer none): the screen for the event
*
* Since: 2.2
**/
GdkScreen *
gdk_event_get_screen (const GdkEvent *event)
{
if (gdk_event_is_allocated (event))
{
GdkEventPrivate *private = (GdkEventPrivate *)event;
if (private->screen)
return private->screen;
}
if (event->any.window)
return gdk_window_get_screen (event->any.window);
return NULL;
}
/**
* gdk_event_get_event_sequence:
* @event: a #GdkEvent
*
* If @event if of type %GDK_TOUCH_BEGIN, %GDK_TOUCH_UPDATE,
* %GDK_TOUCH_END or %GDK_TOUCH_CANCEL, returns the #GdkEventSequence
* to which the event belongs. Otherwise, return %NULL.
*
* Returns: the event sequence that the event belongs to
*
* Since: 3.4
*/
GdkEventSequence *
gdk_event_get_event_sequence (const GdkEvent *event)
{
if (!event)
return NULL;
if (event->type == GDK_TOUCH_BEGIN ||
event->type == GDK_TOUCH_UPDATE ||
event->type == GDK_TOUCH_END ||
event->type == GDK_TOUCH_CANCEL)
return event->touch.sequence;
return NULL;
}
/**
* gdk_set_show_events:
* @show_events: %TRUE to output event debugging information.
*
* Sets whether a trace of received events is output.
* Note that GTK+ must be compiled with debugging (that is,
* configured using the <option>--enable-debug</option> option)
* to use this option.
**/
void
gdk_set_show_events (gboolean show_events)
{
if (show_events)
_gdk_debug_flags |= GDK_DEBUG_EVENTS;
else
_gdk_debug_flags &= ~GDK_DEBUG_EVENTS;
}
/**
* gdk_get_show_events:
*
* Gets whether event debugging output is enabled.
*
* Return value: %TRUE if event debugging output is enabled.
**/
gboolean
gdk_get_show_events (void)
{
return (_gdk_debug_flags & GDK_DEBUG_EVENTS) != 0;
}
/* What do we do with G_IO_NVAL?
*/
#define READ_CONDITION (G_IO_IN | G_IO_HUP | G_IO_ERR)
#define WRITE_CONDITION (G_IO_OUT | G_IO_ERR)
#define EXCEPTION_CONDITION (G_IO_PRI)
static void
gdk_synthesize_click (GdkDisplay *display,
GdkEvent *event,
gint nclicks)
{
GdkEvent *event_copy;
event_copy = gdk_event_copy (event);
event_copy->type = (nclicks == 2) ? GDK_2BUTTON_PRESS : GDK_3BUTTON_PRESS;
_gdk_event_queue_append (display, event_copy);
}
void
_gdk_event_button_generate (GdkDisplay *display,
GdkEvent *event)
{
GdkMultipleClickInfo *info;
g_return_if_fail (event->type == GDK_BUTTON_PRESS);
info = g_hash_table_lookup (display->multiple_click_info, event->button.device);
if (G_UNLIKELY (!info))
{
info = g_new0 (GdkMultipleClickInfo, 1);
info->button_number[0] = info->button_number[1] = -1;
g_hash_table_insert (display->multiple_click_info,
event->button.device, info);
}
if ((event->button.time < (info->button_click_time[1] + 2 * display->double_click_time)) &&
(event->button.window == info->button_window[1]) &&
(event->button.button == info->button_number[1]) &&
(ABS (event->button.x - info->button_x[1]) <= display->double_click_distance) &&
(ABS (event->button.y - info->button_y[1]) <= display->double_click_distance))
{
gdk_synthesize_click (display, event, 3);
info->button_click_time[1] = 0;
info->button_click_time[0] = 0;
info->button_window[1] = NULL;
info->button_window[0] = NULL;
info->button_number[1] = -1;
info->button_number[0] = -1;
info->button_x[0] = info->button_x[1] = 0;
info->button_y[0] = info->button_y[1] = 0;
}
else if ((event->button.time < (info->button_click_time[0] + display->double_click_time)) &&
(event->button.window == info->button_window[0]) &&
(event->button.button == info->button_number[0]) &&
(ABS (event->button.x - info->button_x[0]) <= display->double_click_distance) &&
(ABS (event->button.y - info->button_y[0]) <= display->double_click_distance))
{
gdk_synthesize_click (display, event, 2);
info->button_click_time[1] = info->button_click_time[0];
info->button_click_time[0] = event->button.time;
info->button_window[1] = info->button_window[0];
info->button_window[0] = event->button.window;
info->button_number[1] = info->button_number[0];
info->button_number[0] = event->button.button;
info->button_x[1] = info->button_x[0];
info->button_x[0] = event->button.x;
info->button_y[1] = info->button_y[0];
info->button_y[0] = event->button.y;
}
else
{
info->button_click_time[1] = 0;
info->button_click_time[0] = event->button.time;
info->button_window[1] = NULL;
info->button_window[0] = event->button.window;
info->button_number[1] = -1;
info->button_number[0] = event->button.button;
info->button_x[1] = 0;
info->button_x[0] = event->button.x;
info->button_y[1] = 0;
info->button_y[0] = event->button.y;
}
}
void
gdk_synthesize_window_state (GdkWindow *window,
GdkWindowState unset_flags,
GdkWindowState set_flags)
{
GdkEvent temp_event;
GdkWindowState old;
g_return_if_fail (window != NULL);
temp_event.window_state.window = window;
temp_event.window_state.type = GDK_WINDOW_STATE;
temp_event.window_state.send_event = FALSE;
old = temp_event.window_state.window->state;
temp_event.window_state.new_window_state = old;
temp_event.window_state.new_window_state |= set_flags;
temp_event.window_state.new_window_state &= ~unset_flags;
temp_event.window_state.changed_mask = temp_event.window_state.new_window_state ^ old;
if (temp_event.window_state.new_window_state == old)
return; /* No actual work to do, nothing changed. */
/* Actually update the field in GdkWindow, this is sort of an odd
* place to do it, but seems like the safest since it ensures we expose no
* inconsistent state to the user.
*/
window->state = temp_event.window_state.new_window_state;
if (temp_event.window_state.changed_mask & GDK_WINDOW_STATE_WITHDRAWN)
_gdk_window_update_viewable (window);
/* We only really send the event to toplevels, since
* all the window states don't apply to non-toplevels.
* Non-toplevels do use the GDK_WINDOW_STATE_WITHDRAWN flag
* internally so we needed to update window->state.
*/
switch (window->window_type)
{
case GDK_WINDOW_TOPLEVEL:
case GDK_WINDOW_TEMP: /* ? */
gdk_display_put_event (gdk_window_get_display (window), &temp_event);
break;
case GDK_WINDOW_FOREIGN:
case GDK_WINDOW_ROOT:
case GDK_WINDOW_CHILD:
break;
}
}
/**
* gdk_display_set_double_click_time:
* @display: a #GdkDisplay
* @msec: double click time in milliseconds (thousandths of a second)
*
* Sets the double click time (two clicks within this time interval
* count as a double click and result in a #GDK_2BUTTON_PRESS event).
* Applications should <emphasis>not</emphasis> set this, it is a global
* user-configured setting.
*
* Since: 2.2
**/
void
gdk_display_set_double_click_time (GdkDisplay *display,
guint msec)
{
display->double_click_time = msec;
}
/**
* gdk_set_double_click_time:
* @msec: double click time in milliseconds (thousandths of a second)
*
* Set the double click time for the default display. See
* gdk_display_set_double_click_time().
* See also gdk_display_set_double_click_distance().
* Applications should <emphasis>not</emphasis> set this, it is a
* global user-configured setting.
**/
void
gdk_set_double_click_time (guint msec)
{
gdk_display_set_double_click_time (gdk_display_get_default (), msec);
}
/**
* gdk_display_set_double_click_distance:
* @display: a #GdkDisplay
* @distance: distance in pixels
*
* Sets the double click distance (two clicks within this distance
* count as a double click and result in a #GDK_2BUTTON_PRESS event).
* See also gdk_display_set_double_click_time().
* Applications should <emphasis>not</emphasis> set this, it is a global
* user-configured setting.
*
* Since: 2.4
**/
void
gdk_display_set_double_click_distance (GdkDisplay *display,
guint distance)
{
display->double_click_distance = distance;
}
G_DEFINE_BOXED_TYPE (GdkEvent, gdk_event,
gdk_event_copy,
gdk_event_free)
/**
* gdk_setting_get:
* @name: the name of the setting.
* @value: location to store the value of the setting.
*
* Obtains a desktop-wide setting, such as the double-click time,
* for the default screen. See gdk_screen_get_setting().
*
* Returns: %TRUE if the setting existed and a value was stored
* in @value, %FALSE otherwise.
**/
gboolean
gdk_setting_get (const gchar *name,
GValue *value)
{
return gdk_screen_get_setting (gdk_screen_get_default (), name, value);
}
/**
* gdk_event_get_event_type:
* @event: a #GdkEvent
*
* Retrieves the type of the event.
*
* Return value: a #GdkEventType
*
* Since: 3.10
*/
GdkEventType
gdk_event_get_event_type (const GdkEvent *event)
{
g_return_val_if_fail (event != NULL, GDK_NOTHING);
return event->type;
}
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